diff --git a/crates/blockifier/Cargo.toml b/crates/blockifier/Cargo.toml
index 69bfac8392..80f8e7f912 100644
--- a/crates/blockifier/Cargo.toml
+++ b/crates/blockifier/Cargo.toml
@@ -10,6 +10,7 @@ description = "The transaction-executing component in the Starknet sequencer."
 workspace = true
 
 [features]
+reexecution = []
 cairo_native = ["dep:cairo-native"]
 jemalloc = ["dep:tikv-jemallocator"]
 testing = ["rand", "rstest", "starknet_api/testing"]
diff --git a/crates/blockifier/src/state/cached_state.rs b/crates/blockifier/src/state/cached_state.rs
index d9a4a598f6..f78f1b5307 100644
--- a/crates/blockifier/src/state/cached_state.rs
+++ b/crates/blockifier/src/state/cached_state.rs
@@ -294,6 +294,13 @@ impl Default for CachedState<crate::test_utils::dict_state_reader::DictStateRead
     }
 }
 
+#[cfg(feature = "reexecution")]
+impl<S: StateReader> CachedState<S> {
+    pub fn get_initial_reads(&self) -> StateResult<StateMaps> {
+        Ok(self.cache.borrow().initial_reads.clone())
+    }
+}
+
 pub type StorageEntry = (ContractAddress, StorageKey);
 
 #[derive(Debug, Default, derive_more::IntoIterator)]
diff --git a/crates/blockifier_reexecution/Cargo.toml b/crates/blockifier_reexecution/Cargo.toml
index a2c9aa164f..7a7c3f3d6d 100644
--- a/crates/blockifier_reexecution/Cargo.toml
+++ b/crates/blockifier_reexecution/Cargo.toml
@@ -9,7 +9,7 @@ license.workspace = true
 blockifier_regression_https_testing = []
 
 [dependencies]
-blockifier = { workspace = true, features = ["transaction_serde"] }
+blockifier = { workspace = true, features = ["reexecution", "transaction_serde"] }
 cairo-lang-starknet-classes.workspace = true
 cairo-lang-utils.workspace = true
 clap = { workspace = true, features = ["cargo", "derive"] }
diff --git a/crates/blockifier_reexecution/src/main.rs b/crates/blockifier_reexecution/src/main.rs
index fabd5de409..03a981ec6a 100644
--- a/crates/blockifier_reexecution/src/main.rs
+++ b/crates/blockifier_reexecution/src/main.rs
@@ -1,6 +1,8 @@
+use blockifier_reexecution::state_reader::reexecution_state_reader::ReexecutionStateReader;
 use blockifier_reexecution::state_reader::test_state_reader::{
     ConsecutiveStateReaders,
     ConsecutiveTestStateReaders,
+    SerializableOfflineReexecutionData,
 };
 use blockifier_reexecution::state_reader::utils::JSON_RPC_VERSION;
 use clap::{Args, Parser, Subcommand};
@@ -93,6 +95,67 @@ fn main() {
 
             println!("RPC test passed successfully.");
         }
-        Command::WriteRpcRepliesToJson { .. } => todo!(),
+
+        Command::WriteRpcRepliesToJson {
+            url_and_block_number: SharedArgs { node_url, block_number },
+            directory_path,
+        } => {
+            let directory_path = directory_path.unwrap_or(format!(
+                "./crates/blockifier_reexecution/resources/block_{block_number}/"
+            ));
+
+            // TODO(Aner): refactor to reduce code duplication.
+            let config = RpcStateReaderConfig {
+                url: node_url,
+                json_rpc_version: JSON_RPC_VERSION.to_string(),
+            };
+
+            let ConsecutiveTestStateReaders { last_block_state_reader, next_block_state_reader } =
+                ConsecutiveTestStateReaders::new(BlockNumber(block_number - 1), Some(config), true);
+
+            let block_info_next_block = next_block_state_reader.get_block_info().unwrap();
+
+            let starknet_version = next_block_state_reader.get_starknet_version().unwrap();
+
+            let state_diff_next_block = next_block_state_reader.get_state_diff().unwrap();
+
+            let transactions_next_block = next_block_state_reader.get_all_txs_in_block().unwrap();
+
+            let blockifier_transactions_next_block = &last_block_state_reader
+                .api_txs_to_blockifier_txs_next_block(transactions_next_block.clone())
+                .unwrap();
+
+            let mut transaction_executor = last_block_state_reader
+                .get_transaction_executor(
+                    next_block_state_reader.get_block_context().unwrap(),
+                    None,
+                )
+                .unwrap();
+
+            transaction_executor.execute_txs(blockifier_transactions_next_block);
+
+            let block_state = transaction_executor.block_state.unwrap();
+            let initial_reads = block_state.get_initial_reads().unwrap();
+
+            let contract_class_mapping =
+                block_state.state.get_contract_class_mapping_dumper().unwrap();
+
+            let serializable_offline_reexecution_data = SerializableOfflineReexecutionData {
+                state_maps: initial_reads.into(),
+                block_info_next_block,
+                starknet_version,
+                transactions_next_block,
+                contract_class_mapping,
+                state_diff_next_block,
+            };
+
+            serializable_offline_reexecution_data
+                .write_to_file(&directory_path, "reexecution_data.json")
+                .unwrap();
+
+            println!(
+                "RPC replies required for reexecuting block {block_number} written to json file."
+            );
+        }
     }
 }
diff --git a/crates/blockifier_reexecution/src/state_reader/reexecution_state_reader.rs b/crates/blockifier_reexecution/src/state_reader/reexecution_state_reader.rs
index e0b1b67734..7031825aea 100644
--- a/crates/blockifier_reexecution/src/state_reader/reexecution_state_reader.rs
+++ b/crates/blockifier_reexecution/src/state_reader/reexecution_state_reader.rs
@@ -10,7 +10,7 @@ use super::compile::{legacy_to_contract_class_v0, sierra_to_contact_class_v1};
 use crate::state_reader::errors::ReexecutionError;
 use crate::state_reader::test_state_reader::ReexecutionResult;
 
-pub(crate) trait ReexecutionStateReader {
+pub trait ReexecutionStateReader {
     fn get_contract_class(&self, class_hash: &ClassHash) -> StateResult<StarknetContractClass>;
 
     fn get_class_info(&self, class_hash: ClassHash) -> ReexecutionResult<ClassInfo> {
@@ -33,7 +33,7 @@ pub(crate) trait ReexecutionStateReader {
     }
 
     // TODO(Aner): extend/refactor to accomodate all types of transactions.
-    fn api_txs_to_blockifier_txs(
+    fn api_txs_to_blockifier_txs_next_block(
         &self,
         txs_and_hashes: Vec<(Transaction, TransactionHash)>,
     ) -> ReexecutionResult<Vec<BlockifierTransaction>> {
diff --git a/crates/blockifier_reexecution/src/state_reader/rpc_https_test.rs b/crates/blockifier_reexecution/src/state_reader/rpc_https_test.rs
index dbecf79a3f..24f3f0aa03 100644
--- a/crates/blockifier_reexecution/src/state_reader/rpc_https_test.rs
+++ b/crates/blockifier_reexecution/src/state_reader/rpc_https_test.rs
@@ -187,5 +187,7 @@ pub fn test_get_statediff_rpc(test_state_reader: TestStateReader) {
 #[case(EXAMPLE_DECLARE_V3_BLOCK_NUMBER)]
 pub fn test_get_all_blockifier_tx_in_block(#[case] block_number: u64) {
     let state_reader = TestStateReader::new_for_testing(BlockNumber(block_number));
-    state_reader.api_txs_to_blockifier_txs(state_reader.get_all_txs_in_block().unwrap()).unwrap();
+    state_reader
+        .api_txs_to_blockifier_txs_next_block(state_reader.get_all_txs_in_block().unwrap())
+        .unwrap();
 }
diff --git a/crates/blockifier_reexecution/src/state_reader/test_state_reader.rs b/crates/blockifier_reexecution/src/state_reader/test_state_reader.rs
index 6bde27404c..cf17d22732 100644
--- a/crates/blockifier_reexecution/src/state_reader/test_state_reader.rs
+++ b/crates/blockifier_reexecution/src/state_reader/test_state_reader.rs
@@ -54,12 +54,12 @@ pub struct OfflineReexecutionData {
 
 #[derive(Serialize, Deserialize)]
 pub struct SerializableOfflineReexecutionData {
-    state_maps: ReexecutionStateMaps,
-    contract_class_mapping: StarknetContractClassMapping,
-    block_info_next_block: BlockInfo,
-    starknet_version: StarknetVersion,
-    transactions_next_block: Vec<(Transaction, TransactionHash)>,
-    state_diff_next_block: CommitmentStateDiff,
+    pub state_maps: ReexecutionStateMaps,
+    pub block_info_next_block: BlockInfo,
+    pub starknet_version: StarknetVersion,
+    pub transactions_next_block: Vec<(Transaction, TransactionHash)>,
+    pub state_diff_next_block: CommitmentStateDiff,
+    pub contract_class_mapping: StarknetContractClassMapping,
 }
 
 impl SerializableOfflineReexecutionData {
@@ -80,7 +80,7 @@ impl From<SerializableOfflineReexecutionData> for OfflineReexecutionData {
             contract_class_mapping: value.contract_class_mapping,
         };
         let transactions_next_block = offline_state_reader_prev_block
-            .api_txs_to_blockifier_txs(value.transactions_next_block)
+            .api_txs_to_blockifier_txs_next_block(value.transactions_next_block)
             .expect("Failed to convert starknet-api transactions to blockifier transactions.");
         Self {
             offline_state_reader_prev_block,
@@ -299,6 +299,10 @@ impl TestStateReader {
             class_hash_to_compiled_class_hash: declared_classes,
         })
     }
+
+    pub fn get_contract_class_mapping_dumper(&self) -> Option<StarknetContractClassMapping> {
+        self.contract_class_mapping_dumper.lock().unwrap().clone()
+    }
 }
 
 impl ReexecutionStateReader for TestStateReader {
@@ -372,8 +376,9 @@ impl ConsecutiveStateReaders<TestStateReader> for ConsecutiveTestStateReaders {
     }
 
     fn get_next_block_txs(&self) -> ReexecutionResult<Vec<BlockifierTransaction>> {
-        self.next_block_state_reader
-            .api_txs_to_blockifier_txs(self.next_block_state_reader.get_all_txs_in_block()?)
+        self.next_block_state_reader.api_txs_to_blockifier_txs_next_block(
+            self.next_block_state_reader.get_all_txs_in_block()?,
+        )
     }
 
     fn get_next_block_state_diff(&self) -> ReexecutionResult<CommitmentStateDiff> {
diff --git a/crates/blockifier_reexecution/src/state_reader/utils.rs b/crates/blockifier_reexecution/src/state_reader/utils.rs
index 9df4b4d1f6..8417eb5460 100644
--- a/crates/blockifier_reexecution/src/state_reader/utils.rs
+++ b/crates/blockifier_reexecution/src/state_reader/utils.rs
@@ -49,7 +49,7 @@ pub(crate) fn disjoint_hashmap_union<K: std::hash::Hash + std::cmp::Eq, V>(
 }
 
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
-pub(crate) struct ReexecutionStateMaps {
+pub struct ReexecutionStateMaps {
     nonces: HashMap<ContractAddress, Nonce>,
     class_hashes: HashMap<ContractAddress, ClassHash>,
     storage: HashMap<ContractAddress, HashMap<StorageKey, Felt>>,